It isn't. The idea is that the blockly interface is for users with little experience, who want simple events in the form of a single if..do that are stored individually. For more complex events use lua scripting, there you can implement any logic you want.

I made this event to turn on the lights when there is movement outside the bedroom-doors (for example: someone comes out of his bedroom and is on his way to the bathroom or the stairs). In that case the lights are turned on at 100% (if it's before midnight) or at 20% if it's after midnight.

Need to test it tonigt... I'm not sure if the 'set overloop = level 20 % for 1 minute' will work.